Patents by Inventor Hasnain Akram

Hasnain Akram has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210050832
    Abstract: A method for operating a charge pump having a variable switching frequency may include comparing a target minimum output voltage with an output voltage generated at an output of the charge pump and controlling switching of switches of the charge pump based on the comparison such that the variable switching frequency varies as an output current driven by the charge pump varies.
    Type: Application
    Filed: August 6, 2020
    Publication date: February 18, 2021
    Applicant: Cirrus Logic International Semiconductor Ltd.
    Inventors: Jason W. LAWRENCE, Eric J. KING, Christian LARSEN, Hasnain AKRAM, Eric KIMBALL
  • Patent number: 10819238
    Abstract: A power supply system and method include multiple power conversion units (PCUs) with independent power generation control and a PCU-to-PCU regulation of power, handoff control system to transfer control of power regulation to a load among the PCUs. The multiple PCUs maintain independent power generation control to collectively provide power to the load and handoff regulation of the power to the load from one PCU to another PCU. The term “handoff” refers to communication between PCUs that affects a transfer and acceptance of regulation of power control. The independent PCU power generation control with singularly located but transferable control of the regulation of power provides a flexible dynamic power supply.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: October 27, 2020
    Assignee: Cirrus Logic International Semiconductor, Ltd.
    Inventors: Eric J. King, Eric B. Smith, Hasnain Akram, Sean Davis
  • Patent number: 10326314
    Abstract: A wireless power transmitter includes an inverter in which a voltage varies in response to a resonant network and circuitry configured to (A) measure a characteristic indicative of a load seen by the wireless power transmitter, (B) determine a duty cycle of the inverter based upon the characteristic, and (C) switch the inverter with the determined duty cycle.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: June 18, 2019
    Assignee: MediaTek Inc.
    Inventors: Patrick Stanley Riehl, Hasnain Akram, Philip Frank Tustin
  • Patent number: 10291127
    Abstract: Methods and circuits for controlling a synchronous rectifier. An operating condition of the synchronous rectifier is detected. A voltage level applied to turn on at least one transistor of the synchronous rectifier us modified based upon the detected operating condition, to improve efficiency of the synchronous rectifier.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: May 14, 2019
    Assignee: MediaTek Inc.
    Inventors: Hasnain Akram, Patrick Stanley Riehl
  • Patent number: 10277072
    Abstract: A wireless power receiver IC in which the power path can be reconfigured as either a low-dropout regulator (LDO), a switched-mode power supply (SMPS) or a power switch (PSW) is provided. All three modes share the same pass device to reduce die area and share the same output terminal to reduce pin. In an inductive wireless receiver, the power path can be reprogrammed on the fly to LDO or PSW mode or can be reprogrammed on the fly to SMPS or PSW mode. In a resonant or multi-mode wireless receiver, the power path can be reprogrammed on the fly to SMPS or PSW mode. Furthermore, to achieve high power transfer efficiency performance, using N-channel MOSFET as its pass device has better efficiency and smaller die area than P-channel MOSFET pass device.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: April 30, 2019
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventors: Yung-Chih Yen, Patrick Stanley Riehl, Hasnain Akram, Anand Satyamoorthy
  • Patent number: 10177602
    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: January 8, 2019
    Assignee: Mediatek Singapore PTE, Ltd.
    Inventors: Hasnain Akram, Yung-Chih Yen, Patrick Stanley Riehl, Anand Satyamoorthy
  • Patent number: 10014724
    Abstract: A resonant wireless power (RWP) receiver is provided that includes an inductor element that couples with a resonant wireless power source. A capacitor arrangement is coupled to the inductor element altering the open-circuit impedance of the RWP receiver to reduce the ac voltage under certain defined situations. The capacitor arrangement includes a plurality capacitors tuned to a control ac voltage in the RWP receiver.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: July 3, 2018
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventors: Patrick Stanley Riehl, Anand Satyamoorthy, Hasnain Akram
  • Patent number: 9954400
    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
    Type: Grant
    Filed: January 8, 2015
    Date of Patent: April 24, 2018
    Assignee: MEDIATEK SINGAPORE PTE. LTD.
    Inventors: Hasnain Akram, Yung-Chih Yen, Patrick Stanley Riehl, Anand Satyamoorthy
  • Publication number: 20170302110
    Abstract: A wireless power transmitter includes an inverter in which a voltage varies in response to a resonant network and circuitry configured to (A) measure a characteristic indicative of a load seen by the wireless power transmitter, (B) determine a duty cycle of the inverter based upon the characteristic, and (C) switch the inverter with the determined duty cycle.
    Type: Application
    Filed: January 20, 2017
    Publication date: October 19, 2017
    Applicant: MediaTek Inc.
    Inventors: Patrick Stanley Riehl, Hasnain Akram, Philip Frank Tustin
  • Patent number: 9722462
    Abstract: A resonant wireless power system includes a source circuit having a source coil, an ac driver with a first resistance, representing the equivalent output impedance of the ac driver, and a matching network. A current probe measures the magnitude signal of the instantaneous source coil current. A voltage probe measures the instantaneous ac driver voltage. A phase detector compares the phase of the instantaneous source coil current and the instantaneous ac driver voltage, and produces a first output signal proportional to the phase difference. A first amplifier compares the magnitude signal and a target signal, and produces an error signal proportional to the difference. A first compensation filter produces the control voltage that determines the ac driver supply voltage. A second amplifier amplifies the first output signal. A second compensation filter produces the control voltage that determines the impedance of a variable element in the source circuit.
    Type: Grant
    Filed: August 1, 2013
    Date of Patent: August 1, 2017
    Assignee: MEDIATEK Singapore Pte. Ltd.
    Inventors: Anand Satyamoorthy, Hasnain Akram, Patrick Stanley Riehl
  • Publication number: 20160299521
    Abstract: A synchronous rectifier using only n-channel devices in which the low-side switches are effectively cross-coupled using low-side comparators and the high-side switches perform an accurate zero-voltage-switching (ZVS) comparison. The charging path of each bootstrap domain is completed through the low-side switches, which are each always on for every half-cycle independent of loading. This scheme gives rectifier efficiency gain because a) each bootstrap domain receives maximum charging time, and b) the charging occurs through a switch rather than a diode. Both these factors ensure the bootstrap domain is fully charged, thereby reducing conduction losses through the rectifier switches. Furthermore, settings may be adjusted by software to optimize the resistive and capacitive losses of the rectifier. Using data for die temperature and operating frequency, software can create a feedback loop, dynamically adjusting rectifier settings in order to achieve the best possible efficiency.
    Type: Application
    Filed: January 8, 2015
    Publication date: October 13, 2016
    Inventors: HASNAIN AKRAM, Yung-Chih Yen, Patrick Stanley Riehl, Anand Satyamoorthy
  • Publication number: 20160261191
    Abstract: Methods and circuits for controlling a synchronous rectifier. An operating condition of the synchronous rectifier is detected. A voltage level applied to turn on at least one transistor of the synchronous rectifier us modified based upon the detected operating condition, to improve efficiency of the synchronous rectifier.
    Type: Application
    Filed: January 27, 2016
    Publication date: September 8, 2016
    Applicant: MediaTek Inc.
    Inventors: Hasnain Akram, Patrick Stanley Riehl
  • Publication number: 20150364928
    Abstract: A wireless power receiver IC in which the power path can be reconfigured as either a low-dropout regulator (LDO), a switched-mode power supply (SMPS) or a power switch (PSW) is provided. All three modes share the same pass device to reduce die area and share the same output terminal to reduce pin. In an inductive wireless receiver, the power path can be reprogrammed on the fly to LDO or PSW mode or can be reprogrammed on the fly to SMPS or PSW mode. In a resonant or multi-mode wireless receiver, the power path can be reprogrammed on the fly to SMPS or PSW mode. Furthermore, to achieve high power transfer efficiency performance, using N-channel MOSFET as its pass device has better efficiency and smaller die area than P-channel MOSFET pass device.
    Type: Application
    Filed: January 8, 2015
    Publication date: December 17, 2015
    Inventors: Yung-Chih Yen, Patrick Stanley Riehl, HASNAIN AKRAM, Anand Satyamoorthy
  • Publication number: 20140246923
    Abstract: A resonant wireless power (RWP) receiver is provided that includes an inductor element that couples with a resonant wireless power source. A capacitor arrangement is coupled to the inductor element altering the open-circuit impedance of the RWP receiver to reduce the ac voltage under certain defined situations. The capacitor arrangement includes a plurality capacitors tuned to a control ac voltage in the RWP receiver.
    Type: Application
    Filed: September 27, 2013
    Publication date: September 4, 2014
    Applicant: MediaTek Singapore Pte. Ltd.
    Inventors: Patrick Stanley Riehl, Anand Satyamoorthy, Hasnain Akram
  • Publication number: 20140035384
    Abstract: A resonant wireless power system includes a source circuit having a source coil, an ac driver with a first resistance, representing the equivalent output impedance of the ac driver, and a matching network. A current probe measures the magnitude signal of the instantaneous source coil current. A voltage probe measures the instantaneous ac driver voltage. A phase detector compares the phase of the instantaneous source coil current and the instantaneous ac driver voltage, and produces a first output signal proportional to the phase difference. A first amplifier compares the magnitude signal and a target signal, and produces an error signal proportional to the difference. A first compensation filter produces the control voltage that determines the ac driver supply voltage. A second amplifier amplifies the first output signal. A second compensation filter produces the control voltage that determines the impedance of a variable element in the source circuit.
    Type: Application
    Filed: August 1, 2013
    Publication date: February 6, 2014
    Applicant: MediaTek Singapore Pte. Ltd.
    Inventors: Anand Satyamoorthy, Hasnain Akram, Patrick Stanley Riehl